/Engine/Plugins/Runtime/AR/Google/GoogleARCore/Source/GoogleARCoreBase/Public/GoogleARCoreTypes.h
A delegate can be bound through C++. It will be called before ARSession started and returns a list of supported ARCore camera configurations. Bind this delegate if you want to choose a specific camera config in your app. Call UGoogleARCoreSessionFunctionLibrary::ConfigARCoreCamera after the delegate is triggered.
static FGoogleARCoreOnConfigCameraDelegate OnCameraConfig;